Carbureter.



A. G. REDMOND.

CARBURETER.

APPLICATION FILED DEC. 12, 1914.

Patented Nov. 21, 1916.

psi

@TATE PATEIW ALBERT G. REDMOND, OF FLINT, MICHIGAN, ASSIGNOR T0 MARVEL CARBURETER COMPANY, OF FLINT, IJIICHIGAN, A CORPORATION OF INDIANA.

CABBURETER.

Application filed December 12. 1914.

To all whom it may concern Be it known that I, Anmnrr G. REDMOND, a citizen of the United States, residing at Flint, in the county of (ienesce and State. of h'lichigan, have invented certain new and useful improvements in tarbureters, of which the following is a specification, reference being had therein to the accompanying drawing. 1

This invention relates'to certain new and useful improvements in carburetors and more particularly to that class of carbureter in which a suction-controlled valve is employed for regulating the amount of fuel supplied to the carbureting chamber; the object of the invention being to provide means for controlling the. movement of the airvalve whereby the correct amount of air and gasolene or fuel will be admitted to the chamber.

Another object of my invention is to provide a carbureter in which means provided for injecting an additional amount of fuel into the carbureting chamber when the throttle valve is opened suddenly so as to increase the richness of the mixture in order to allow the machine to which the carbureter is attached, to get under way very quickly.

Another object of the invention is to provide a carbureter which is exceedingly simple and cheap in construction and one in which the parts are so arranged and mounted that a very compact carburetcr is formed and one which is very strong and durable.

Another object of the invention is to provide means for adjusting the movement of the air valve through the medium of a planger working within a cylinder or well in the nature'of a dash pot; said plunger being normally held in a raised position by a coil spring arranged beneath the same so as to normally hold the air valve in closed position.

Another object of the invention is to provide a carburetor in which the resistance to the air valve is reduced to a minimum, just enough resistance being employed to hold the air valve in its adjustedposition according to the vacuum created within the carhureting chamber, thereby obtaining a clear mixture at all times so as to prevent the choking of the motor to which the carbureter is attached.

Another and further object of the in- Specification of Letters Patent.

Patented Nov. 21.- H9163.

Serial No. 876,800.

vcntion is to provide a carburetor with means for injecting into the carbureting chamber an extra charge of fuel upon the sudden opening of the throttle valve. means being provided for allowing the fuel to escape from the injector when the throttle valve is opened slowly.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims.

In the drawing, 1 have shown a longitudinal vertical section through a carbureter constructed in accordance with my invention, in which 1 indicates a bowl forming a fuel and float chamber 2. The float chamber is closed by a cover 3 which is provided with a depending cylindrical portion forming a well having a detachable plug 5 secured in the side thereof adjacent its bottom and a detachable ejector plug (3 secured in its bottom, the passage in the plug 5 being of a larger diameter than the plug (5 for the purpose hereinafter fully described.

The cylindrical portion 4' terminates in an enlarged portion 7 which is provided with passageways 8 communicating with a chamber 9 which is closed by a detachable drain plug 10 having a threaded end portion which screws into the internally threaded portion of the chamber 5) and securely locks the cover in position upon the bowl 1.

Pivotally mounted within the float chamber 2 is a float 11 surrounding the cylindrical portion -l cooperating with a valve 12 for controlling the supply of gasolene or fuel through the feed passage 13 to which is connected a supply pipe 14 and as herein shown, a strainer 15 is arranged within the outer end of the feed passage at the end of the supply pipe so as to strain the fuel as it enters the carbureter. In this construction, it will be seen that the fuel within the float chamber is maintained at a desired level by the float through the medium of the valve.

Mounted within the well formed by the cylindrical casing 4 is a hollow plunger 16 which is normally held in raised position by a coil spring 17 mounted in the bottom of the well; said spring being of just sufiicient strength to keep the plunger in raised posi tion as shown in the drawing, the upper end of said plunger being provided with a rounded head 18 which engages one of the arms of a bell crank 19 mounted upon a suitable pivot 20 carried by lugs 21 extending upwardly from the cover 3. Extending upwardly from the cover 3 is an arm which is provided with a threaded bore 23 in which is mounted an adjusting screw 24 adapted to engage the upper side of the arm of the bell crank 19 and limit the movement of the same, said adjusting screw 24 being held in its adjusted position by a lock nut 25. The purpose of this adjustment will be hereinafter more fully described. A suitable vent A is formed in the casing 4 below the normal position of the end of the plunger 16 to allow the air to escape therefrom when the carbureter is initially being filled.

The plug 10 is provided with a passage way 26 which communicates with a passage 27 formed in an arm 28 which is mounted upon the plug 10 as clearly shown in the drawing; said arm terminating in an enlarged portion 29 upon which is mounted a casing 30 forming a carbureting chamber 31 which is provided with an air inlet 32 and an outlet 33 which is adapted to be connected to the engine in the ordinary manner, said outlet being provided with the usual throttle valve 34.

The air inlet is provided with a choker valve 35. The passageway 27 of the arm 28 communicates with a low speed nozzle 36 which is provided with the usual needle valve 37 for controlling the flow of fuel therethrough, said nozzle extending up in the carbureting chamber 31 and being-surrounded by a false bottom of the carbureting chamber in order to allow the air to pass around the low speed nozzle so as to draw the fuel therefrom in the well known manner.

The nozzle 36 is provided with an outlet passage 38 adjacent its lower end which communicates with a passage 39 formed in the enlarged end 29 'of the arm 28 in which is mounted a stand pipe 40 having a high speed nozzle 41 mounted in its upper end adjacent one wall of the carbureting chamher, as clearly shown in the drawing.

Mounted within the carbureting chamber is an air valve 42 for normally closing the air inlet port until the suction of the engine creates a vacuum within the carbureting chamber of sufficient strength to lift the same, said valve terminating at its lower end in a bypass 43 which allows a certain amount of air to pass into the false bottom around the low speed nozzle 36. The air valve 42 is mounted upon an oscillating shaft 42 and is provided with a central notch to receive the portion of the carbureter in which the shaft is mounted.

The casing 30 forming the carbureting chamber 31 is provided with a boss 44 in which is mounted a bearing sleeve 45 having a bar 46 mounted therein which is normally held by gravity in engagement with the wear-plate 47 secured on the air valve 42 as it will be noticed that the boss 44 and bearing sleeve 45 are disposed at an angle so as to allow the bar 46 to slide by gravity into engagement with the air valve 42 and to be held in such position until the same is moved by the movement of the valve within the air chamber. The 0 posite end of the bar 46 extends outwar ly into alinement with the arm of the bell crank 19 so' that when the air valve 42 is raised by the suction of the engine, the bell crank will be rocked upon its pivot so as to depress the plunger 16 against the tension of the spring and the fluid within the well which forms a dash pot so as to check the sudden opening of the air valve.

The bell crank 19 is normally adjusted through the medium of the adjusting screw 24 so as to allow a slight movement of the bar 46 which in turn allows the air valve to move slightly before the bar is thrown into engagement with the bell crank and it will be seen by this construction that by adjusting the set screw, the amount of movement allowed the air valve before it operates the plunger through the medium of the bell crank and bar, can be determined so as to obtain the best results.

As the plunger 16 is moved upwardly a certain amount of gasolene or fuel is drawn therewith and to prevent the same from gradually working out of the top of the bowl, I provide the cylindrical portion 4 with an annular chamber 48 surrounding the upper end thereof, the upper end thereof provided with inlet passages 49 and outlet passages 50 so that the fuel drawn up by the plunger around the side thereof will be conveyed into the chamber 48 from which it will be lead back into the bowl.

In the operation of a carbureter as hereinbefore fully described, supposing that the parts are in the position shown in the drawing, with the bowl partially filled with fuel and the throttle valve is opened gradually, a vacuum is gradually created within the carbureting chamber so as to open the air valve 42 which forces the bar 46 upwardly until it engages one of the arms of the bell crank 19 which is rocked upon its pivot so as to depress the plunger 16 against the tension of the spring and the fluid within the bottom of the well, the movement of the plunger being so gradual that the fluid within the bottom of the well is forced out through the larger plug 5 back into the float chamber. On the other hand, if the throttle is opened suddenly, a vacuum is created within the mixing chamber and the air valve 42 swings quickly upon its pivot so as to force the plunger downwardly quickly through the medium of the bar and bell crank and as the plunger is forced downwardly, the pressure exerted thereon is such that all of the fluid cannot escape through the plug 5 and it is, therefore, injected through the plug 6 into the passage of the plug 10 and through the conveying passages out through the low speed nozzle so as to increase the supply of fuel delivered into the carbureting chamber which allows the engine to which the carbureter is attached, to be started quickly.

I claim:

1. In a carbureter, the combination with a suction-controlled air inlet valve, of a dash pot, acrank cooperating with said dash pot, means for limiting the movement of said crank in one direction, and a movable member arranged between said crank and air inlet valve for controlling the movement of said valve.

2. In a carbureter, the combination with a suction-controlled air inlet valve, of a dash pot, a crank engaged by said dash pot,

' and a slidably mounted member arranged in the path of travel of said air valve and crank.

3. In a carbureter, the combination with a carbureting chamber, of a suction-controlled air valve mounted therein, a casing, a plunger mounted in said casing, a spring for normally holding said plunger in raised position, an oscillating member arranged in thepath of travel of said plunger and a cooperatin movable member arranged between sald oscillating member and air valve whereby the movement of said valve is retarded by said plunger.

4. In a carbureter, the" combination with a fuel chamber, of a carbureting chamber,

passages leading from said fuel chamber to said carbureting chamber, an air valve, a spring-supported plunger mounted in the fuel chamber, means for depressing said plunger, and a slidable member operated by the opening movement of said air valve for actuating said plunger-depressing means for injecting an additional charge of fuel from said fuel chamber to said carbureting chamber.

5. In a carbureter, the combination with a fuel chamber, of a carbureting chamber, passageways leading from said fuel chamher to said carbureting chamber, an air valve, a gravity member arranged in the path of travel of said air valve and normally held in contact therewith for initially retarding the movement of said air valve, an oscillating member arranged in the path of travel of said gravity member and normally out of contact therewith, and means cooperating with said oscillating member for exerting a resistance to the final opening movement of said air valve.

6. In a carbureter, the combination with a suction-controlled air valve, of a dash pot, a movable member arranged in the path of travel of said air valve and normally held in contact therewith, an oscillating member arranged in the path of travel of said movable member and a con nection between said dash pot. and oscillating member for retarding the movement of said air valve.

7. In a carbureter, the combination with a movable suction-controlled air valve, of a slidably mounted bar arranged in the path of travel of said air valve and normally held in contact therewith, a crank arranged in the path of travel of said slid ably mounted bar and a spring supported piston arranged under one of the arms of said crank.

8. In a carbureter, the combination with a suction-controlled air valve, of a cylinder, a piston working within said cylinder, a spring for supporting said piston within said cylinder, a crank having an arm arranged in the path of travel of said piston, means for limiting the movement of said crank in one direction, and a slidably mounted member arranged in the path of travel of said suction-controlled valve and crank lever.

9. In a carbureter, the combination with a fuel and float chamber, of a cylinder disposed centrally within said chamber, a plug arranged within said cylinder at its lower end communicating with said chamber, a plunger working in said cylinder, a spring arranged within said cylinder for normally holding said plunger in raised position, a

bell crank having an arm arranged in the path of travel of said plunger, an adjustable member arranged in the path of travel of said bell crank, and means operated by the movement of the air valve of said member for rocking said bell crank.

10. In a carbureter, the combination with a suction-controlled air valve, of means for retardingthe movement of said valve comprising a spring-supported piston, a bell crank and a slidably mounted member, and means for regulating the movement of said bell crank in one direction.

11. A carbureter, having a carbureting chamber and a fuel chamber, passages com municating said chambers, a suction-controlled air valve, a movable member arranged in the path of travel of said air valve, a piston, an oscillating member cooperating with said piston and movable member or injecting a charge of fuel from said fuel chamber to said carbureting chamber by the sudden movement of said suction-controlled air valve.

12. In a carbureter, having a carbureting chamber and a fuel chamber, the combination with a suction-controlled air valve, of a spring supported plunger, an oscillating member mounted in the path of travel of said plunger, means for limiting the movement of said oscillating member in one direction, a movable member arranged between said osclllating member and suctioncontrolled air valve and normally held out of contact with the oscillating member.

13. In a carbureter, the combination with a suction-controlled air valve, a cylinder having ports in its lower end, a spring-supported plunger mounted within said cylinder, a crank arranged in the path of travel of said plunger, and a slidably mounted member normally held in engagement with said air valve and adapted to engage said crank for depressing said plunger upon the movement of said air valve.

14. A carbureter, comprising a carbureting chamber and a fuel chamber having passageways communicating with said chambers, a pivoted air valve, a plunger mounted in the fuel chamber for ejecting a charge of fuel therefrom, a crank arranged in the path of travel of said plunger for depressing said plunger, and a movable gravity member operated by the opening of said air valve for operating said crank.

15. In a carbureter, the combination with a carbureting chamber, of a suction-controlled air valve mounted therein, a fuel chamber, nozzles projecting into said carbureting chamber, passages communicating said nozzles with said fuel chamber, a plunger for injecting fuel out of said fuel chamber through said passages, an oscillating member arranged in the path of travel of said plunger, a movable member arranged in the path of travel of said air valve and cooperating with said oscillating member for operating said plunger.

16. A carbureter, having a suction-controlled air valve, of a movable member for normally holding said air valve in closed position, an oscillating member arranged in the path-of travel of said movable member and normally held out of contact therewith for allowing an initially free movement of said movable member and means arranged in the path of travel of said oscillating member for increasing the resistance to the opening movement of said air valve on the final movement of said valve.

17. A carbureter, having a mixing cham- .ber and a fuel chamber with passages communicating said chambers, an air valve mounted in the mixing chamber, a cylinder arranged within the fuel chamber, a springsupported plunger mounted within said cylinder, plugs mounted within said cylinder having bores of different diameters, a crank arranged in the path of travel of said plunger, and a movable member arranged between said air valve and crank and adapted to displace the liquid out of said cylinder upon the downward movement of said plunger.

18. In a carbureter, the combination with a suction-controlled air inlet valve normally held in closed position, of a movable member normally held in contact with said air valve, an oscillating member arranged in the path of travel of said movable member and normally held out of contact therewith and allowing an initially free movement thereof, a dash pot cooperating with said oscillating member and means for limiting they movement of said oscillating member in one di-. rection.

19. In a carbureter, the combination with an air inlet valve, of a gravity movable member for normally holding said valve in closed position, an oscillating member arranged in the path of travel of said movable member and normally held out of contact therewith, a plunger cooperating with said oscillating member for retarding the movement thereof to increase the resistance to the final opening movement of said air valve.

20. In a carbureter, the combination with a suction-controlled air valve normally held in closed position by gravity, a slidably mounted bar engaging said valve and capable of an initially free movement and means arranged in the path of travel of said bar for retarding the final movement thereof.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

ALBERT G. REDMOND.

\Vitnesses HENRY J. TURNER, HENRY R. BROWNE. 

